package cn.gov.msa.util;


import javax.servlet.ServletInputStream;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

import org.springframework.util.StreamUtils;
/**
 * @version 1.0.0
 */
public class RepeatedlyReadRequestWrapper extends HttpServletRequestWrapper {
	 private final byte[] body;

	    public RepeatedlyReadRequestWrapper(HttpServletRequest request) throws IOException {
	        super(request);
	        String sessionStream = getBodyString(request);
	        body = sessionStream.getBytes(Charset.forName("UTF-8"));
	    }

	    /**
	     * 获取请求Body
	     *
	     * @param request
	     * @return
	     */
	    public String getBodyString(final ServletRequest request) {
	        StringBuilder sb = new StringBuilder();
	        InputStream inputStream = null;
	        BufferedReader reader = null;
	        try {
	            inputStream = cloneInputStream(request.getInputStream());
	            reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("UTF-8")));
	            String line = "";
	            while ((line = reader.readLine()) != null) {
	                sb.append(line);
	            }
	        }
	        catch (IOException e) {
	            e.printStackTrace();
	        }
	        finally {
	            if (inputStream != null) {
	                try {
	                    inputStream.close();
	                }
	                catch (IOException e) {
	                    e.printStackTrace();
	                }
	            }
	            if (reader != null) {
	                try {
	                    reader.close();
	                }
	                catch (IOException e) {
	                    e.printStackTrace();
	                }
	            }
	        }
	        return sb.toString();
	    }

	    /**
	     * Description: 复制输入流</br>
	     *
	     * @param inputStream
	     * @return</br>
	     */
	    public InputStream cloneInputStream(ServletInputStream inputStream) {
	        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
	        byte[] buffer = new byte[1024];
	        int len;
	        try {
	            while ((len = inputStream.read(buffer)) > -1) {
	                byteArrayOutputStream.write(buffer, 0, len);
	            }
	            byteArrayOutputStream.flush();
	        }
	        catch (IOException e) {
	            e.printStackTrace();
	        }
	        InputStream byteArrayInputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());
	        return byteArrayInputStream;
	    }
	    @Override
	    public BufferedReader getReader() throws IOException {
	        return new BufferedReader(new InputStreamReader(getInputStream()));
	    }

	    @Override
	    public ServletInputStream getInputStream() throws IOException {

	        final ByteArrayInputStream bais = new ByteArrayInputStream(body);

	        return new ServletInputStream() {

	            @Override
	            public int read() throws IOException {
	                return bais.read();
	            }
	        };
	    }
}